Mathematics – Class 11 Practice Test 10

1. Two dice are thrown simultaneously. Let A be the event of getting sum less than 4 and B be the event of getting sum not more than 4. Find set “A and not B”.

2. If 4 bulbs are there each of which can be defective or non-defective then what is the probability that all the bulbs are defective?

3. Probability of getting prime number on dice is ___________

4. If an event has more than one sample point then it is called _____________

5. Event “B but not A” is represented by _____________

6. If two coins are tossed simultaneously what is the probability of getting exactly one head?

7. In direct method to prove statement “If p then q” is valid or not, we assume p to be __________ and prove q to be _____________

8. What is the probability of impossible event?

9. The mean of 5 observations is 3 and variance is 2. If three of the five observations are 1, 3, 5, find the other two.

10. Which symbol denotes sure event?